North Reading Engineering HiFi Forum

CROSSOVER NETWORKS => Passive Networks => Topic started by: duder1982 on Jan 13, 2023, 11:12 PM

Title: Passive for BMS 4590 coaxial
Post by: duder1982 on Jan 13, 2023, 11:12 PM
Looking to see of anyone has built a passive for BMS 4590?  Attached is what I found for schematic online and assuming it will work for home audio on a k402, I have no idea on what some of these parts are and could help build a BOM.

Title: Re: Passive for BMS 4590 coaxial
Post by: nre on Jan 15, 2023, 06:51 AM
The schematic with inverted HF and 16Ohm mid has an ideal electrical response (simulation with resistors as loads) below.  Low frequencies are passed to the mid section of the driver assembly which is problematic.  The resistor pad provides -6dB attenuation.

BMS_4590.jpg

The photo of the factory net shows a simple arrangement (two caps and a tiny inductor) which may be where the schematic came from? 

BMS.jpg 
Title: Re: Passive for BMS 4590 coaxial
Post by: duder1982 on Jan 15, 2023, 12:01 PM
Quote from: nre on Jan 15, 2023, 06:51 AMThe photo of the factory net shows a simple arrangement (two caps and a tiny inductor which may be where the schematic came from

I'm not sure where it came from. I believe I may have 2 schematics somewhere in my files.  One from the factory and one from DIYAUDIO.COM from another user.

I wouldn't mind trying a factory passive if one was readily available.